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Identify KNO3 and KH2PO4 at home


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5












$begingroup$


I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?






inorganic-chemistry home-experiment







share|improve this question









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  • 2




    $begingroup$
    KNO3 is much better soluble in water.
    $endgroup$
    – Mithoron
    13 hours ago






  • 4




    $begingroup$
    I'm a bit confused by the question. Are you asking how to differentiate between $ce{KNO3}$ and $ce{KH2PO4}$, or are you asking how to identify each of these salts from the multitude of other inorganic salts?
    $endgroup$
    – MaxW
    7 hours ago
















5












$begingroup$


I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?






inorganic-chemistry home-experiment







share|improve this question









New contributor




Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$








  • 2




    $begingroup$
    KNO3 is much better soluble in water.
    $endgroup$
    – Mithoron
    13 hours ago






  • 4




    $begingroup$
    I'm a bit confused by the question. Are you asking how to differentiate between $ce{KNO3}$ and $ce{KH2PO4}$, or are you asking how to identify each of these salts from the multitude of other inorganic salts?
    $endgroup$
    – MaxW
    7 hours ago














5












5








5





$begingroup$


I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?






inorganic-chemistry home-experiment







share|improve this question









New contributor




Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




I am not expert in chemistry. I need to find a way to identify a $ce{KNO3}$ and $ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is the easiest way to do it at home?






inorganic-chemistry home-experiment




inorganic-chemistry home-experiment






share|improve this question









New contributor




Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 9 hours ago









andselisk

17k655115




17k655115






New contributor




Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked 15 hours ago









IchsanIchsan

291




291




New contributor




Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor





Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Ichsan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








  • 2




    $begingroup$
    KNO3 is much better soluble in water.
    $endgroup$
    – Mithoron
    13 hours ago






  • 4




    $begingroup$
    I'm a bit confused by the question. Are you asking how to differentiate between $ce{KNO3}$ and $ce{KH2PO4}$, or are you asking how to identify each of these salts from the multitude of other inorganic salts?
    $endgroup$
    – MaxW
    7 hours ago














  • 2




    $begingroup$
    KNO3 is much better soluble in water.
    $endgroup$
    – Mithoron
    13 hours ago






  • 4




    $begingroup$
    I'm a bit confused by the question. Are you asking how to differentiate between $ce{KNO3}$ and $ce{KH2PO4}$, or are you asking how to identify each of these salts from the multitude of other inorganic salts?
    $endgroup$
    – MaxW
    7 hours ago








2




2




$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
13 hours ago




$begingroup$
KNO3 is much better soluble in water.
$endgroup$
– Mithoron
13 hours ago




4




4




$begingroup$
I'm a bit confused by the question. Are you asking how to differentiate between $ce{KNO3}$ and $ce{KH2PO4}$, or are you asking how to identify each of these salts from the multitude of other inorganic salts?
$endgroup$
– MaxW
7 hours ago




$begingroup$
I'm a bit confused by the question. Are you asking how to differentiate between $ce{KNO3}$ and $ce{KH2PO4}$, or are you asking how to identify each of these salts from the multitude of other inorganic salts?
$endgroup$
– MaxW
7 hours ago










4 Answers
4






active

oldest

votes


















6












$begingroup$

Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.






share|improve this answer









$endgroup$









  • 1




    $begingroup$
    This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
    $endgroup$
    – Mithoron
    13 hours ago






  • 1




    $begingroup$
    @Mithoron so be sure to use the pH-paper to test regular water too.
    $endgroup$
    – JAD
    4 hours ago



















5












$begingroup$

In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.



If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).



$ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.






share|improve this answer











$endgroup$





















    4












    $begingroup$

    Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.



    Video https://www.youtube.com/watch?v=dJRqJ145dyM






    share|improve this answer









    $endgroup$





















      -1












      $begingroup$

      If you have a soluble calcium salt, you can add that to a solution of your powder. Calcium nitrate is quite soluble, but calcium phosphate should precipitate out:
      $ce{Ca(NO3)2}$ has a solubility of around 1200 g/L (!) while $ce{Ca3(PO4)2}$ is insoluble.






      share|improve this answer









      $endgroup$









      • 1




        $begingroup$
        You won't have the neutral salt, and the acidic phosphates are more soluble.
        $endgroup$
        – Ivan Neretin
        5 hours ago











      Your Answer





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      4 Answers
      4






      active

      oldest

      votes








      4 Answers
      4






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      6












      $begingroup$

      Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.






      share|improve this answer









      $endgroup$









      • 1




        $begingroup$
        This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
        $endgroup$
        – Mithoron
        13 hours ago






      • 1




        $begingroup$
        @Mithoron so be sure to use the pH-paper to test regular water too.
        $endgroup$
        – JAD
        4 hours ago
















      6












      $begingroup$

      Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.






      share|improve this answer









      $endgroup$









      • 1




        $begingroup$
        This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
        $endgroup$
        – Mithoron
        13 hours ago






      • 1




        $begingroup$
        @Mithoron so be sure to use the pH-paper to test regular water too.
        $endgroup$
        – JAD
        4 hours ago














      6












      6








      6





      $begingroup$

      Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.






      share|improve this answer









      $endgroup$



      Well, given that one is a weak acid and the other is the salt of a strong base and a strong acid, the pH of a solution of the powder should tell you which it is. If it's $ce{KNO3}$ it should neutral, and if it's $ce{KH2PO4}$ it should be acidic. Just need some pH paper, which you could probably buy at a pool supply store.







      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered 14 hours ago









      ringoringo

      19.9k557107




      19.9k557107








      • 1




        $begingroup$
        This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
        $endgroup$
        – Mithoron
        13 hours ago






      • 1




        $begingroup$
        @Mithoron so be sure to use the pH-paper to test regular water too.
        $endgroup$
        – JAD
        4 hours ago














      • 1




        $begingroup$
        This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
        $endgroup$
        – Mithoron
        13 hours ago






      • 1




        $begingroup$
        @Mithoron so be sure to use the pH-paper to test regular water too.
        $endgroup$
        – JAD
        4 hours ago








      1




      1




      $begingroup$
      This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
      $endgroup$
      – Mithoron
      13 hours ago




      $begingroup$
      This could work, but KH2PO4 solution would have pH somewhere around 4.7 - water used at home might be as acidic as this, I guess.
      $endgroup$
      – Mithoron
      13 hours ago




      1




      1




      $begingroup$
      @Mithoron so be sure to use the pH-paper to test regular water too.
      $endgroup$
      – JAD
      4 hours ago




      $begingroup$
      @Mithoron so be sure to use the pH-paper to test regular water too.
      $endgroup$
      – JAD
      4 hours ago











      5












      $begingroup$

      In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
      You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.



      If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).



      $ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.






      share|improve this answer











      $endgroup$


















        5












        $begingroup$

        In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
        You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.



        If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).



        $ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.






        share|improve this answer











        $endgroup$
















          5












          5








          5





          $begingroup$

          In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
          You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.



          If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).



          $ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.






          share|improve this answer











          $endgroup$



          In the absence of other chemicals you can utilize the fact that nitrates(V) are much stronger oxidizing agents than phosphates(V).
          You can soak a piece of newspaper in a saturated solution of the salt, let it dry well in a ventilated place and try to ignite it.



          If the salt was $ce{KNO3}$, it will burn vigorously and fast (that's why kids are often using paper soaked in sodium nitrate as primitive fuse for home-made firecrackers and rockets).



          $ce{KH2PO4}$ doesn't promote combustion of paper, so it will burn normally or even slower.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 9 hours ago

























          answered 9 hours ago









          andseliskandselisk

          17k655115




          17k655115























              4












              $begingroup$

              Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.



              Video https://www.youtube.com/watch?v=dJRqJ145dyM






              share|improve this answer









              $endgroup$


















                4












                $begingroup$

                Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.



                Video https://www.youtube.com/watch?v=dJRqJ145dyM






                share|improve this answer









                $endgroup$
















                  4












                  4








                  4





                  $begingroup$

                  Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.



                  Video https://www.youtube.com/watch?v=dJRqJ145dyM






                  share|improve this answer









                  $endgroup$



                  Touch medium samples of both salts with a glowing ember. No noticable effect would be observed on contact with $ce{KH2PO4}$. Contact with $ce{KNO3}$ shall produce noticeable flame.



                  Video https://www.youtube.com/watch?v=dJRqJ145dyM







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 9 hours ago









                  permeakrapermeakra

                  18.1k13681




                  18.1k13681























                      -1












                      $begingroup$

                      If you have a soluble calcium salt, you can add that to a solution of your powder. Calcium nitrate is quite soluble, but calcium phosphate should precipitate out:
                      $ce{Ca(NO3)2}$ has a solubility of around 1200 g/L (!) while $ce{Ca3(PO4)2}$ is insoluble.






                      share|improve this answer









                      $endgroup$









                      • 1




                        $begingroup$
                        You won't have the neutral salt, and the acidic phosphates are more soluble.
                        $endgroup$
                        – Ivan Neretin
                        5 hours ago
















                      -1












                      $begingroup$

                      If you have a soluble calcium salt, you can add that to a solution of your powder. Calcium nitrate is quite soluble, but calcium phosphate should precipitate out:
                      $ce{Ca(NO3)2}$ has a solubility of around 1200 g/L (!) while $ce{Ca3(PO4)2}$ is insoluble.






                      share|improve this answer









                      $endgroup$









                      • 1




                        $begingroup$
                        You won't have the neutral salt, and the acidic phosphates are more soluble.
                        $endgroup$
                        – Ivan Neretin
                        5 hours ago














                      -1












                      -1








                      -1





                      $begingroup$

                      If you have a soluble calcium salt, you can add that to a solution of your powder. Calcium nitrate is quite soluble, but calcium phosphate should precipitate out:
                      $ce{Ca(NO3)2}$ has a solubility of around 1200 g/L (!) while $ce{Ca3(PO4)2}$ is insoluble.






                      share|improve this answer









                      $endgroup$



                      If you have a soluble calcium salt, you can add that to a solution of your powder. Calcium nitrate is quite soluble, but calcium phosphate should precipitate out:
                      $ce{Ca(NO3)2}$ has a solubility of around 1200 g/L (!) while $ce{Ca3(PO4)2}$ is insoluble.







                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered 6 hours ago









                      AlaskaRonAlaskaRon

                      69449




                      69449








                      • 1




                        $begingroup$
                        You won't have the neutral salt, and the acidic phosphates are more soluble.
                        $endgroup$
                        – Ivan Neretin
                        5 hours ago














                      • 1




                        $begingroup$
                        You won't have the neutral salt, and the acidic phosphates are more soluble.
                        $endgroup$
                        – Ivan Neretin
                        5 hours ago








                      1




                      1




                      $begingroup$
                      You won't have the neutral salt, and the acidic phosphates are more soluble.
                      $endgroup$
                      – Ivan Neretin
                      5 hours ago




                      $begingroup$
                      You won't have the neutral salt, and the acidic phosphates are more soluble.
                      $endgroup$
                      – Ivan Neretin
                      5 hours ago










                      Ichsan is a new contributor. Be nice, and check out our Code of Conduct.










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                      Ichsan is a new contributor. Be nice, and check out our Code of Conduct.
















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                      Variacions dels escacs de CapablancaEscacs a la dècada del 1970 variació d'escacsjanusalfilcavallJanus1978Alemanyapeces d'escacspeonstorrereidamaescacsenrocescac i matGrans Mestres d'escacsVíktor KortxnoiPéter LékóArtur Iussúpov a b c d e f g h i j 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 a b c d e f g h i j Escacs Janus . El Janus (compost per cavall + alfil) és situat a la columnes "b" i "i", al costat de les torres. Els escacs Janus són una variació d'escacs jugada en un tauler de 10×8 caselles. La seva característica diferenciadora és una nova peça, el janus (també coneguda com a arquebisbe o carden...
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